Very nice art, sound and music. Nailed the atmosphere! Couple of suggestions:
1. Increased brightness/gamma, or option for it: Too hard to see some of the beautiful art you created. :)
2. While the font of the letters/diaries fits the theme very well, it is kinda hard to read (maybe just for me). I'd try something a bit more readable (handwriting style fonts perhaps?).
3. Flashing the interact key near objects. I kept pressing E and F and took me a while to realize that SPACE is the interact key.
4. Map maybe? Just a crude one? I don't know, maybe I just have a terrible sense of direction. :D
Overall, this game is gonna be great, I am really excited to see where you take it from here. Good work!